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AS Physics P1 MCQs Preparation Thread.
sin will be zero for the middle maximum. -
PAPER 1 MAY/JUNE 2013 PHYSICS DOUBTS HERE
It's the answer to the torque question... Asked by somebody else... Must have quoted you by mistake. Sorry! -
A level Biology: Post your doubts here!
All you have to do is measure the distance and use the equation I=AM, I being image length (the thing you've measured), A being actual length and M the magnification. And you have to make sure that they're all in the same units. -
Chemistry: Post your doubts here!
Make sure you use the correct units. It doesn't necessarily have to be on the right or left side; it'll be on the side of the -CO2. For example, an ester will be like this: acid-CO2-alcohol, or alcohol-O2C-acid. The C of the CO2 will be part of the c. acid. -
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Chemistry: Post your doubts here!
6 is done simply by using pV=nRT. Compound Z is an ester, so the answer can be either C or D. D shows an ester formed using propanoic acid and C shows an ester formed using hexanoic acid. Compound X has 6 Carbons. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
I didn't read the question properly. The question asks which alcohol will give the largest number of alkenes when dehydrated. A, B, C & D can all be dehydrated, but some will give more alkenes than others. For example, A & D can give only one alkene, because the C of the COH is attached to only... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
No, the Carbon attached to -OH group must be attached to a Carbon which is attached to a Hydrogen. -
AS Physics P1 MCQs Preparation Thread.
To compare the distances. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Argh, I apologise. This isn't the first time this has happened! Anyway: 6. The volume of O2 is more, so there must have been more moles of H2O2. More moles -> higher concentration. 25. If an alcohol is to be dehydrated, the C of the C-OH must be attached to a C attached to an H atom. -
AS Physics P1 MCQs Preparation Thread.
The centre of the screen is always a maximum because the path difference of the waves = o so they're exactly in phase. -
AS Physics P1 MCQs Preparation Thread.
Here's a way of doing it: s=u^2/2a. Assume that u = 300 and a = 50. s will then = 900. Increasing 300 by 20% will make it 360. If a stays the same, s = 1296. 1296/900=1.44. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
11. Barium nitrate decomposes to BaO and the unreactive gas is N2. 24. Attacking group is OH- and leaving group is Br-. 28. When heated with hot, conc., acidified KMnO4, the C=C bonds will break and turn into C=O bonds. 31. Radius is the same always because number of outer electrons is the same... -
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P1 MCQ's preparation thread for chemistry ONLY!!!!
Two H atoms are missing in your compound. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
6. The answer is A because you see from the a/t graph that acceleration becomes constant at 1/2T. In B the acceleration becomes 0 at 1/2 T, in C the velocity is zero & in D there's increasing acceleration throughout. 25. The fundamental frequency is when lambda is 1/4. The first overtone will be... -
AS Physics P1 MCQs Preparation Thread.
22. Stress=F/A. F and A is given. E=stress/strain. strain=stress/E. 26. Use dsin90=nxlambda and multiply that times 2 (the other 90 degrees) and add 1 (the middle maximum). -
AS Physics P1 MCQs Preparation Thread.
Use v^2=u^2+2as. a=F/m. To find F, draw a free-body diagram on the 1 kg mass, and m will be 3 kg. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
Not sure about 21 but 31: a polymer is many monomers, so you'll need much more than one mole of a monomer to get 1 polymer. With 1 mole of monomer, you'll get any number of polymers less than 1, e.g. 0.00001 moles. -
AS Physics P1 MCQs Preparation Thread.
18. Use P=Fv. 7. When there's air resistance, the horizontal component decreases to 0. The vertical becomes constant (terminal velocity). 9. Use a suvat equation.